Six initial public offerings have been priced so far in 2008, as of 25th January.

IPO PERFORMANCE

Shares of RiskMetrics Group Inc. (RMG: chart) soared more than 30% on Friday, after the company priced its initial public offering of 14 million shares at $17.5, near the low end of expectations.

The New York-based company had expected to price between $17 and $19 per share, according to the filing.

The company offered nearly 10 million shares, while the group of stockholders sold the remaining 4 million shares.

Credit Suisse, Goldman Sachs and Banc of America Securities were the lead underwriters on the deal.

RiskMetrics provides its clients with products and services that allow them to measure portfolio risk across security types, geographies and markets.

The shares ended the week at $23.75 a share, up 36% from the offering price.

Shares of IPC The Hospitalist Co. (IPCM: chart) gained nearly 30% in their first day of trading Friday, after the company priced its initial public offering of 5.2 million shares at $16 per share, within the expected price range of $15 to $17 per share.

IPC offered 3.3 million shares, while a group of selling stockholders offered the remaining 1.9 million shares.

The company raised $75.2 million with the offering.

Credit Suisse, Jefferies, Wachovia Capital and William Blair served as underwriters.

The selling stockholders have granted the underwriters an option to buy up to 705,000 additional shares to cover over-allotments.

The North Hollywood, California-based company provides inpatient care, primarily in hospital settings.

The shares ended the week at $20.48 a share, up 28% from the offering price.

IPO CALENDAR – week of January 28th

Chinese computer-based testing and education company ATA, Inc. (ATAI: chart) plans to offer 4.9 million American depositary shares, each representing two common shares, within an expected range of $9.50-$11.50 a share, in a bid to raise $46 million. Merrill Lynch will be the lead underwriter on the deal.

Water and wastewater services company Cascal (HOO: chart) plans to offer 12 million shares within a price range of $12-$13, in a bid to raise $144 million. J.P. Morgan and Credit Suisse will be the lead managers on the deal.

Water and wastewater services company ReneSola (SOL: chart) plans to offer 10 million American depositary shares, each representing two shares, within a price range of $15-$17.50 per ADS, in a bid to raise $130 million. Credit Suisse and Deutsche Bank will be the lead underwriters on the deal.

Intermodal equipment lessor Seacastle (SC: chart) plans to offer 20 million shares within a price range of $15-$17, in a bid to raise $390 million. Citi, Bear Stearns, Deutsche Bank, and Merrill Lynch will be the managers on the deal.